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@ARTICLE{Hofzumahaus:33390,
author = {Hofzumahaus, A. and Kraus, A. and Kylling, A. and Zerefos,
C. S.},
title = {{S}olar actinic radiation (280-420 nm) in the cloud-free
troposphere between ground and 12 km altitude : measurements
and model results},
journal = {Journal of geophysical research / Atmospheres},
volume = {107},
issn = {0022-1406},
address = {Washington, DC},
publisher = {Union},
reportid = {PreJuSER-33390},
pages = {PAU 6-1 - 6-6},
year = {2002},
note = {Record converted from VDB: 12.11.2012},
abstract = {[1] Airborne measurements of the spectrally resolved
actinic flux (280-420 nm) between the ground and 12 km
altitude have been made using a new calibrated dual-channel
spectroradiometer. The measurements were made as part of the
Photochemical Activity and Ultraviolet Radiation/Altitude
Dependence of the Tropospheric Ozone Photolysis (PAUR/ATOP)
measurement campaign in Greece during June 1996. Flights
were made over the Agean Sea under cloudless conditions for
various aerosol loads and solar zenith angles. The spectral
actinic flux measurements are compared with radiative
transfer model simulations based on the multistream discrete
ordinate radiative transfer (DISORT) algorithm. All input to
the radiative transfer model was provided by independent
measurements performed simultaneously on the nearby island
of Agios Efstratios. For altitudes between 3000-12,000 m the
agreement between the measurements and the model simulations
is within $+/-5\%$ for wavelengths larger than 310 nm and
within $+/-10\%$ at 295-310 nm. For the lowest flight
altitude, 108 m, the model underestimates the measured
actinic flux systematically by about $12\%.$ This may be
partly explained by uncertainties in the aerosol optical
properties and the surface albedo. Flights on days with
small and large amounts of aerosols showed that under
otherwise identical conditions the actinic flux increased by
up to $10\%$ when the aerosol amount was larger.},
keywords = {J (WoSType)},
cin = {ICG-II},
ddc = {550},
cid = {I:(DE-Juel1)VDB48},
pnm = {Chemie und Dynamik der Geo-Biosphäre},
pid = {G:(DE-Juel1)FUEK257},
shelfmark = {Meteorology $\&$ Atmospheric Sciences},
typ = {PUB:(DE-HGF)16},
UT = {WOS:000180427400007},
doi = {10.1029/2001JD900142},
url = {https://juser.fz-juelich.de/record/33390},
}